Timelike Compton scattering: exclusive photoproduction of lepton pairs

By E. Berger, M. Diehl, B. Pire, ´Ecole Polytechnique, F-91128 Palaiseau. 2001

148 citations recorded by the source corpus.

Abstract We investigate the exclusive photoproduction of a heavy timelike photon which decays into a lepton pair, $\gamma p\to \ell^+\!\ell^- p$. This can be seen as the analog of deeply virtual Compton scattering, and we argue that the two processes are complementary for studying generalized parton distributions in the nucleon. In an unpolarized experiment the angular distribution of the leptons readily provides access to the real part of the Compton amplitude. We estimate the possible size of this effect in kinematics where the Compton process should be dominated by quark exchange.

Subfields: Atomic and Molecular Physics, and Optics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/1923a84927ed4c9abc1419bdbdd2e014ad4e8ea3

Citations in the corpus

• Theory of deeply virtual Compton scattering on the nucleon (2001, unknown): “ton BH propagators, Q2P 1 ≡ (k− q 2)2 = Q2 +2k·∆, Q2P 2 ≡ (k−∆)2 = −2k·∆+∆2 , (28) 2Note that only in the case of massless leptons, a partial cancellation of propagators occurs in the squared BH term [41]. 10 where k·∆ = − Q2 2y(1+ǫ2) ( 1+2Kcosφ− ∆2 Q2 1−x B(2−y)+ yǫ2 2 ! + yǫ2 2 ) . (29) The 1/Q-po”